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Round|Natural|GIA

1.20ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 1328547279

Certificate GIA 1328547279

Diamond specifications and retailer prices

From £2,544 GBP
As of November 1, 2026
Save £3,128 GBP (55%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: £5,672 GBP at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 1.2ct natural round diamond

This 1.2ct natural round sits in the classic one-carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1328547279. Listed at 21 retailers as of November 5, 2026, with prices from £2,544 to £5,672, a £3,128 spread on the same certified stone. NZ Jewellers lists it at £5,672. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

1.20
Carat
I
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.5°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 1328547279
Dimensions6.77 × 6.72 × 4.22 mm
L/W Ratio1.01
Culet sizeNone
Top View
6.77 mm6.72 mm1.20 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1328547279
Side View
Table 56.0%Crown 36.5°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 62.8%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: £5,672 GBP|Low: £2,446 GBP|High: £5,672 GBP|Avg: £3,393 GBP
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
Retailer 17
Retailer 18
Retailer 19
Retailer 20
November 6, 2026
Retailer 3£2,544 GBP
Retailer 19£2,544 GBP
Retailer 7£2,595 GBP
Retailer 2£2,696 GBP
Retailer 5£2,817 GBP
Retailer 13£2,921 GBP
Retailer 4£2,943 GBP
Retailer 10£2,950 GBP
Retailer 11£2,950 GBP
Retailer 14£3,278 GBP
Retailer 8£3,287 GBP
Retailer 20£3,287 GBP
Retailer 16£3,371 GBP
Retailer 9£3,399 GBP
Retailer 12£3,409 GBP
Retailer 17£3,444 GBP
Retailer 6£3,683 GBP
Retailer 15£3,972 GBP
Retailer 18£5,171 GBP
NZ Jewellers£5,672 GBP

38 data points across 20 retailers

21 retailers£2,544 GBP to £5,672 GBP

B+
Cheapest Retailer
-
£2,544 GBP
B+
Retailer 2
-
£2,544 GBP
View
B+
Retailer 3
-
£2,595 GBP
View
B+
Retailer 4
-
£2,696 GBP
View
Final sale: no returns
B+
Retailer 5
-
£2,700 GBP
View
B
Retailer 6
-
£2,817 GBP
View
B+
Retailer 7
-
£2,921 GBP
View
B+
Retailer 8
-
£2,943 GBP
View
B+
Retailer 9
-
£2,950 GBP
View
Retailer 10
-
£2,950 GBP
View
Price last confirmed 8 days ago
B+
Retailer 11
-
£3,278 GBP
View
B
Retailer 12
-
£3,287 GBP
View
B
Retailer 13
-
£3,287 GBP
View
B
Retailer 14
-
£3,371 GBP
View
B
Retailer 15
-
£3,399 GBP
View
Retailer 16
-
£3,409 GBP
View
Price last confirmed 28 days ago
B
Retailer 17
-
£3,444 GBP
View
Retailer 18
-
£3,683 GBP
View
Price last confirmed 14 days ago
B
Retailer 19
-
£3,972 GBP
View
B
Retailer 20
-
£5,171 GBP
View
Most Expensive
B
NZ Jewellers
ab56c08d-b5e9-43cc-b4c1-58d99346cb36 · Nov 5
£5,672 GBP
$7,592 USD
View
20 more retailers have this diamond
Prices start from £2,544 GBPSave up to £3,128 GBP

Carat Hunter is not affiliated with, endorsed by, or sponsored by any retailer listed. Retailer information is from publicly available sources and may not be current. Verify details directly with the retailer before purchasing. Return terms as we hold them. Check the retailer's own returns page before you buy.

B+
1.20ct Round
£2,544 GBP